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Port Mirroring
Note. If the mirroring port monitors mirrored traffic on an RMON probe belonging to a different VLAN
than the mirrored port, it must be protected from blocking due to Spanning Tree updates. See
ing Ports (Protection from Spanning Tree)" on page 26-19
The diagram on the following page illustrates how port mirroring can be used with an external RMON
probe to copy RMON probe frames and Management frames to and from the mirroring and mirrored ports.
Frames received from an RMON probe attached to the mirroring port can be seen as being received by the
mirrored port. These frames from the mirroring port are marked as if they are received on the mirrored
port before being sent over the switch backplane to an NMS station. Therefore, management frames
destined for the RMON probe are first forwarded out of the mirrored port. After being received on the
mirrored port, copies of the frames are mirrored out of the mirroring port—the probe attached to the
mirroring port receives the management frames.
NMS Workstation
B. ...appear to come from the mirrored port
when the NMS Workstation receives them.
C. Management frames from the NMS Workstation are sent to the mirrored port....
NMS Workstation
page 26-16
Mirrored
OmniSwitch
Mirrored Port
Port Mirroring Using External RMON Probe
OmniSwitch AOS Release 7 Network Configuration Guide
Diagnosing Switch Problems
for details.
A. RMON probe frames sent from the mirroring port
Mirroring Port
RMON Probe
D. ...and port mirroring sends copies of the
Management frames to the mirroring port.
Mirroring Port
RMON Probe
OmniSwitch
"Unblock-
March 2011
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